LoL stopped that promotion awhile back from what I know of. Unless it says on the box that there is a LoL gift it should be in there, I bought the same headphones 2 weeks ago and I didn't get a promotion for LoL
Unfortunately the 788 won't work for a gaming console, just for a computer. Either a Mac or Windows. We do have headsets that are compatible with an Xbox one, like the Rig Flex LX. http://www.plantronics.com/us/product/rig-flex-lx